Improvement in screws for imparting motion to machinery



' panying drawings, of which- "'Fi'g. 3 is a plan of a worin, a b, and an exterexternal or internal arrangement or a rack.

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Darin n. n. corrin, Ju., or NEWTON', tnissncfro'sfrrrs.

impnovs'memm scREws 'son imma-rms Motion ro MAcnlNERv.

Speccationl forning'part of Letters latent No. 150,136, datod April 28, 1874 application led February 5, 187 4.

The 'gear is provided with a face. broad cnpugh to ,mesh into at least one entire revolution of the screw-thread. il

Ordinary linear worhs mit be llSell ful' tile externally-toothed nutlwheel'or the 1'acknut,' shown in Fig. 4.

The internally-toothed wormgear or nutw'heel is susceptible of and should havesnch aconstruction or form of teeth that the screwthread above described will so nearly fit the teeth or nut as to be approximately equal in point of fairliearing and 'wearing surfaces to an ordinary or linear screw and nut. As 1 do. not know of a better way in which to describe this form of tootlror nut intelligibly to the ordinary mechanic or: skilled workman, I-will forms otlarack-nnt, Fig. 5 shows theworm. rdest-.ribeit as thatV form or construction o f or screws of Fig. 1, provided iwith nut of a tooth or n ut whichl would be produced by'tlre uniform construction, and adapted for either use of a inilling-toolor cutter, having the saine form as the above-described screw and threadf 1. The complex 0r toothed screw, substantially as described.

2. The toothed screw, in combination with the impelling gear-wheel e, suhstantialr as described.

3. The combination of the toothed screw with the internal or external nut-wheel or woringear or rack, substantially as described.

4. The combination of the toothed screw Mt-...nt whstantially as described.

To all whom it may concern: Be nimm-n that I, DAVID )213. Corrm, Jr., of Newton, in the county of Middlesex and State of liIassachusetts, have invented an Improvement in Screws for Imparting lNIotion to' Machinery, of which the following is a specitication: Y

The invention is illustrated in the accoma b an lend View of thc impelling-gear c, and section of an -internal annular nut or wormgear, c. Fig. 2'is a'plan of the sameparts.

Figure l Shows an end Yicw of the screw;

nally-toothed worm-gear or nut-wheel or segment, c. Fig. 4 is a plan of a worm and two Fig. 6'is a sectional View, illustrating the oo nstruction of the improved screw adapted to an internal nut-wheel-l Fig. 'l is a perspective View of one of the improved screws.

The peculiar construction of the thread of the improved screw is illustrated in Fig. 6,. the forni thereof being such that any section taken transversely to the spiral direction ot the thread around its axis, and through that .r- ,nmmnv mmosite to the axis of 

